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Microstructured FBG hydrogen sensor based on Pt-loaded WO3.

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    Summary
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    A novel hydrogen gas sensor using platinum-tungsten oxide (Pt-WO3) films on a spiral fiber Bragg grating (FBG) offers rapid detection. This enhanced sensor shows improved sensitivity and stability for practical hydrogen leak detection.

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    Area of Science:

    • Materials Science
    • Nanotechnology
    • Sensor Technology

    Background:

    • Hydrogen gas detection is crucial for safety and industrial processes.
    • Existing hydrogen sensors often face limitations in response time, sensitivity, or operating conditions.
    • Fiber Bragg gratings (FBGs) offer a robust platform for developing optical sensors.

    Purpose of the Study:

    • To develop and characterize a novel hydrogen gas sensor based on Pt-WO3 films integrated with a spiral microstructured FBG.
    • To evaluate the sensing performance, including sensitivity, response time, and stability, of the proposed sensor.
    • To assess the potential of this sensor for practical hydrogen leak detection applications.

    Main Methods:

    • Fabrication of a spiral microstructured FBG using a femtosecond laser.
    • Preparation of platinum-tungsten oxide (Pt-WO3) thin films via a hydrothermal method.
    • Sputtering a 2 μm Pt-WO3 film onto a double spiral microstructure FBG with a 60 μm pitch.
    • Testing the sensor's response to varying hydrogen concentrations (0.02% to 4% H2) at room temperature.

    Main Results:

    • The Pt-WO3/spiral FBG sensor demonstrated hydrogen detection capabilities at room temperature.
    • The sensor exhibited a significantly reduced response time, from minutes to 10-30 seconds.
    • A high hydrogen sensitivity of 522 pm/%(v/v) H2 was recorded, approximately 2-4 times higher than standard FBGs.
    • The sensor showed good stability and minimal interference from humidity.

    Conclusions:

    • The developed Pt-WO3 film on a spiral microstructured FBG sensor offers a promising solution for hydrogen gas detection.
    • The sensor's fast response, high sensitivity, wide detection range, and stability make it suitable for practical hydrogen leak detection.
    • Further research could explore optimization for enhanced performance and broader environmental monitoring applications.